The Artist has asked for critique!

Middle character: I think the knees/thigh should be slightly higher -- currently, they seem to be occupying the same space as the couch cushion. The couch seems to be somewhat firm based on the way the other characters are sitting, but the middle character seems to be sinking deep into the cushions.

Left character: once the middle character's legs are raised, the left characters' head should raise a little to match. This will bring their shoulders up as well (if you google for pictures of people laying on couches, you'll see what I mean). This means the upper arm will fall at more of a 45-degree angle from the shoulder to the couch cushion (whereas you almost have the upper arm straight). Try looking at this for an example: http://cookinginplaingreek.com/wp-content/uploads/2012/12/Woman-lying-on-couch.jpg The bend in the foot is a little extreme as well, but not a big deal if that's a stylistic choice!

Right character: Looking pretty good! The major thing that seems odd to me is that she doesn't seem to be sitting fully on the couch -- I'd just maybe redraw her butt (or maybe make the torso a tad longer?) so that the inside edge of the couch can't be seen, and maybe bring the foot a bit closer to the edge of the couch cushion so she looks like she's occupying a bit more space.

Overall though, I love the way the characters are interacting -- it looks very comfy and safe. I hope that helps!